Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1978-08-31
1983-05-10
Lovering, Richard D.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
B22F 102, B22F 316
Patent
active
043828183
ABSTRACT:
A process for improving alloying efficiency in making powder alloy sintered compacts is disclosed. A master alloy (non-iron-based) powder is formulated for admixture in small amounts (2.5-6.0%) to a relatively pure iron based powder and free carbon powder to provide liquid phase sintering and production of a substantially homogeneous product having the characteristics of a wrought alloy product. The master alloy powder is inert gas atomized and chemically constituted to contain at least two elements selected from the group consisting of and in the percentage ranges for the alloy powder of manganese (40-72%), nickel (12-30%), molybdenum (5-11%), chromium (3-20%), copper and iron (1-40%. The master alloy powder may contain additions of a wetting agent, silicon up to 3% and rare earth metals up to 2%, either of which assist to speed up diffusion and create a more favorable liquidus-solidus relationship within the master alloy powder. The iron-based powder is water atomized and annealed to contain less than 1% impurities. The admixture is compacted and heated in a protective atmosphere to a temperature in the range of 1900-2250 to facilitate liquidification only of the master alloy powder for diffusion into the base iron powder and thus provide sintering.
REFERENCES:
patent: 2238382 (1941-04-01), Boegehold
patent: 2856281 (1958-10-01), Cremer et al.
patent: 3689257 (1972-09-01), Oda et al.
Ford Motor Company
Johnson Olin B.
Lovering Richard D.
Malleck Joseph W.
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